If we speak about the data side of PTS... It should be almost the same amount of players as on live server playing for pretty long to generate data based on which we can immediately say how it will be working on live server. So even if we do mega-big rewards and PTS will have more than enough players, guess what then? The live servers will be unpopulated :) Plus I'm sure those players will never leave feedback and the feedback has nothing to do with data generated by players, kinda different things.
And I said that:
So it may happen, but I don't think so for the reasons I said above.
From now on let's discuss the feedback, shall we? For the rewards etc. you are free to create a separate topic in discussion section.